The actress kept her prior-arranged Monday slot on US fashion reality show Project Runway: All Stars, say PEOPLE*.

[*US gossip magazine PEOPLE, not just people on the street, obviously].

Unlike many Hollywood couples - who leave their rings on for a while (Seal, we're looking at you) - Katie had already taken wedding jewellery off and made no attempt to hide her naked hand.

She even managed a small smile as she arrived at the venue with her bare fingers on show - is that a look of relief?

The actress didn't attempt to hide the fact she was wearing no wedding ring (Image: Splash)

The show she is working on - a spin-off of our very own Project Runway - is filmed at The New School of Design in New York City, with Katie rocking up with huge security guards to protect her from any stalking threats from rogue Scientologists.

We'll have to wait until the series airs on July 19 to see how Katie handled being back at work so swiftly.

Is that a smile on Katie's face as she leaves the Project Runway studio in New York City? (Image: Splash)

Hot on her heels: Katie escorted to her car after the show (Image: Splash)

Press scrum: Katie Holmes is surrounded by photographers as she leaves (Image: Splash)

Katie Holmes filed for divorce from husband of five years Tom Cruise late last week, giving work colleagues worldwide plenty of fodder for chats around the watercooler and sparking scores of conspiracy theories.

Scientology is to blame! Tom's too controlling! It's the weather! Okay, we added in the last one but, truth be told, we're not sure what we talked about before this shock(ish) celebrity split...

Hang on, no, everyone was chatting about Adele, Adele being pregnant!

Now THAT is good news! Take that one home with you, it's the gossip equivalent of a cup of tea.